I've got 3 es nodes on ec2. I added ebs volume to each (1 at a time), stopped es, copied data/log to the new volume, edited config file to point to new location, and restarted es. Each time the cluster went green within a few seconds. I forgot to change the config file on the second one, so I edited it, and restarted es again. After that, the cl…

yellow-es-nodes.sh

# Before data migration
curl -XGET 'http://127.0.0.1:9200/_cluster/health?pretty=true'

# {
#   "cluster_name" : "abc_cluster",
#   "status" : "green",
#   "timed_out" : false,
#   "number_of_nodes" : 3,
#   "number_of_data_nodes" : 3,
#   "active_primary_shards" : 20,
#   "active_shards" : 40,
#   "relocating_shards" : 2,
#   "initializing_shards" : 0,
#   "unassigned_shards" : 0
# }

# After data migration
curl -XGET 'http://127.0.0.1:9200/_cluster/health?pretty=true'

# {
#   "cluster_name" : "abc_cluster",
#   "status" : "yellow",
#   "timed_out" : false,
#   "number_of_nodes" : 5,
#   "number_of_data_nodes" : 5,
#   "active_primary_shards" : 20,
#   "active_shards" : 33,
#   "relocating_shards" : 0,
#   "initializing_shards" : 4,
#   "unassigned_shards" : 3
# }